NOVEL WATERBORNE POLYURETHANE BASED ELECTROLYTES FOR LITHIUM BATTERIES - (II) THE EFFECT OF ADDING LICF3SO3-PC

New type electrolytes with the addition of LiCF3SO3-PC into polymer fi lms of waterborne polyurethane (WPU) prepared from our modified aceton e process are investigated by using alternating current (AC) impedance and cyclic voltammetry (CV) for their ionic conductivities and interf acial characteristics. The conductivities calculated from the results of AC impedance obey an Arrhenius law. The conductivity and the charge transfer resistance of WPU based electrolytes increases and decreases , respectively, with increasing addition of LiCF3SO3-PC. The room temp erature conductivities of WPU electrolytes are improved from 10(-5) si milar to 10(-6) S cm(-1) to similar to 10(-3) S cm(-1) by adding LiCF3 SO3-PC from 10 wt% to 70 wt%. However, the CV results of WPU electroly te with 70 wt% of LiCF3SO3-PC in a Li/WPU electrolyte/Li cell exhibit unstable voltammetric behaviour at 65 degrees C, which is attributable to its unstable dimension at high temperature.